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How is it possible to perform a open circuit test on a induction motor?

During the open circuit test of a induction motor ,not any current flows inside the rotor.But how can we achieve such a thing?

Here is the ping configuration of a induction motor:

![](https://electrical.codidact.com/uploads/k3wp88rboqgfgc5zr080e0sp9gkc)

The coils of the stator/rotor will be always connected to the power source and depending on how we connect the pins labelled $W_{2}$,$U_{2}$,$Y_{2}$ together we end up with a Wye or Delta configuration.So if the coils of stator/rotor are always connected to the power source how can we create the circumstances for a open  circuit test?